img {
    width: 100%;
    height: 100%;
    display: block;
}

.banner {
    width: 100%;
    height: 600px;
    background-color: skyblue;
}
.banner > .banner-center {
    width: 1190px;
    height: 600px;
    margin: 20px auto;
    border-top: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
}
.box {
    width: 450px;
    height: 515px;
    display: flex;
    flex-direction: column;
    border: 1px solid #333;
    margin: 20px;
    position: relative;
}
.enlarge {
    position: absolute;
    top: 0;
    left: 450px;
    width: 450px;
    height: 515px;
    background: url(../images/large.jpeg) no-repeat;
    background-size: 545px 545px;
    background-position: 0px 0px;
    display: none;
}
.show {
    width: 450px;
    height: 450px;
    border-bottom: 1px solid #333;
    cursor: none;
}
.list {
    flex: 1;
    height: 46px;
    display: flex;
}
.list > p {
    margin: 4px 20px;
    cursor: pointer;
    width: 54px;
    height: 54px;
    border: 1px solid orange;
    position: relative;
}
.mask {
    width: 300px;
    height: 300px;
    background-color: yellow;
    opacity: .5;
    position: absolute;
    top: 100px;
    left: 100px;
    border: 1px solid #ccc;
    display: none;
    pointer-events: none;
}